==Recurring themes and styles==
* The main melody piano and bassline of "La Mer" is repeated in the intro of reused for "Into The Void", and the bass line is reused on the entire track. A similar but much slower The piano melody motif is also played at the end of "We're In This Together"at a slower tempo.* The piano melody of in "The Frail" is repeated in the guitar solo of "The Fragile".* The descending wah guitar melody played during the intro of "We're In This Together" is similar to the wah guitar that occurs roughly halfway into "Complication".* The three note motif used in the first part of "The Great Below" is briefly quoted in the ending of "We're In This Together" two semitones down and at a slower tempo. This melody may also be used to end the guitar solo, and may be played on a background synth at the end of the first verse of "The Wretched".* "The Great Below" climax melody and bassline are reused for a quiet bridge in the leftover/outtake "And All That Could Have Been".* A sampler keyboard pad created from Reznor's voice is used for "The Frail" and leftover/outtake "Leaving Hope".* Rapidly ascending, very chromatic guitar riffs are prominently featured in "Somewhat Damaged", "The Day The World Went Away", and "The Wretched".* Mike Garson's piano improvisations are prominently featured on "Just Like You Imagined", "The Way Out is Through", and "Ripe (With Decay)".* The lyric "underneath it all" from "The Way Out is Through" is repeated in and used to title "Underneath It All".* The lyrics "now you know/this is what it feels like" are the refrain for both "The Wretched" and leftover/outtake "The Great Collapse".
* The lyric "[[Nothing Can Stop Me Now|nothing can stop me now]]" appears in "La Mer" and "We're In This Together", albeit translated into French Creole on the former and altered to "none of them can stop us now" on the latter. The same phrase was previously used in "[[Piggy]]", "[[Ruiner]]" and "[[Big Man With A Gun]]" and would recur later in "[[Sunspots]]".
* The guitar melody played during lyrics of "The Great Below" and "Underneath It All" are similarly composed, and both use the intro of refrain "all I do/I can still feel you".* The lyric "We're In This Togethercould have been" is similar to the melody that occurs roughly halfway into prominently used in "The Wretched", "The Great Below" and "ComplicationAnd All That Could Have Been".
==Formats==